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// Copyright 2014 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build linux && (ppc64 || ppc64le) .file "gcc_linux_ppc64x.S" // Define a frame which has no argument space, but is compatible with // a call into a Go ABI. We allocate 32B to match FIXED_FRAME with // similar semantics, except we store the backchain pointer, not the // LR at offset 0. R2 is stored in the Go TOC save slot (offset 24). .set GPR_OFFSET, 32 .set FPR_OFFSET, GPR_OFFSET + 18*8 .set VR_OFFSET, FPR_OFFSET + 18*8 .set FRAME_SIZE, VR_OFFSET + 12*16 .macro FOR_EACH_GPR opcode r=14 .ifge 31 - \r \opcode \r, GPR_OFFSET + 8*(\r-14)(1) FOR_EACH_GPR \opcode "(\r+1)" .endif .endm .macro FOR_EACH_FPR opcode fr=14 .ifge 31 - \fr \opcode \fr, FPR_OFFSET + 8*(\fr-14)(1) FOR_EACH_FPR \opcode "(\fr+1)" .endif .endm .macro FOR_EACH_VR opcode vr=20 .ifge 31 - \vr li 0, VR_OFFSET + 16*(\vr-20) \opcode \vr, 1, 0 FOR_EACH_VR \opcode "(\vr+1)" .endif .endm /* * void crosscall_ppc64(void (*fn)(void), void *g) * * Calling into the gc tool chain, where all registers are caller save. * Called from standard ppc64 C ABI, where r2, r14-r31, f14-f31 are * callee-save, so they must be saved explicitly. */ .globl crosscall_ppc64 crosscall_ppc64: // Start with standard C stack frame layout and linkage mflr %r0 std %r0, 16(%r1) // Save LR in caller's frame mfcr %r0 std %r0, 8(%r1) // Save CR in caller's frame stdu %r1, -FRAME_SIZE(%r1) std %r2, 24(%r1) FOR_EACH_GPR std FOR_EACH_FPR stfd FOR_EACH_VR stvx // Set up Go ABI constant registers li %r0, 0 // Restore g pointer (r30 in Go ABI, which may have been clobbered by C) mr %r30, %r4 // Call fn mr %r12, %r3 mtctr %r3 bctrl FOR_EACH_GPR ld FOR_EACH_FPR lfd FOR_EACH_VR lvx ld %r2, 24(%r1) addi %r1, %r1, FRAME_SIZE ld %r0, 16(%r1) mtlr %r0 ld %r0, 8(%r1) mtcr %r0 blr #ifdef __ELF__ .section .note.GNU-stack,"",%progbits #endif